AT&T 3B2/300 Technical Reference Manual page 197

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CM524A PROCESSING ELEMENT CARD
The CM524A Processing Element (PE) Card improves system performance by providing another
processing unit similar to that of the system board. The CM524A Card plugs into a Processor Bus
(PBUS) backplane slot (labeled PROCn). The CM524A Card contains a Central Processing Unit (CPU),
Memory Management Unit (MMU), Math Acceleration Unit (MAU), and 24-megahertz clock to form
the secondary processing unit.
The Processing Element feature requires UNIX System V Release 3.2.2 or later and a CM519B
Backplane. Also, the Multiprocessor Enhancement Utilities software must be installed before any
system performance can be obtained.
The CM524A Card is a single-width card measuring 6.5 inches wide by 7.4 inches deep. The card
uses surface mounted technology. Figure 2-60 shows the component layout of a typical CM524A PE
Card. Connector pinout information is provided in Appendix B. The major components of the
CM524A Card are listed below:
• A WE 32200 CPU chip
• A WE 32201 MMU chip
• A WE 32206 MAU chip
• BK bytes of Static Random Access Memory (SRAM)
• Software controllable timer for rough time measurements and dynamic performance timing
• A 24-MHz oscillator.
EQUIPMENT DESCRIPTION 2-173